KR20000027067A - Flat braun tube - Google Patents

Abstract

PURPOSE: A flat Braun tube is provided to simplify a process for fixing a shadow mask to a panel and accomplishes the simplification of a component by forming a step acting as a rail to a panel instead of removing the rail used to fix the shadow mask to the panel. CONSTITUTION: A flat Braun tube comprises a flat panel(1), a shadow mask(4) where a number of beam penetration holes and a funnel(6) where an electron gun is built in. A stepped projection part(1b) having an appropriate height is formed along an edge inside the panel, and a fixing plate is attached to the stepped projection part. The funnel and the shadow mask are fixed on the fixing plate of the stepped projection part by welding. The fixing plate is made of a metal.

Description

Flat CRT

The present invention relates to a flat CRT, and more particularly, to form a step that acts as a rail in the panel itself instead of removing the rail used to fix the shadow mask to the panel, thereby simplifying parts and fixing the shadow mask. The process is simple.

In general, CRTs (or cathode ray tubes) are used in television receivers or video display devices, and are divided into curved and flat surfaces according to the shape of the image plane, and the curved shape gradually decreases due to the distortion of the image plane. On the other hand, the flat type is closer to the screen, and its demand is gradually spreading.

As shown in FIG. 1, the flat CRT is a flat panel 1 having a phosphor 1a coated on its inner surface, and a safety glass 2 fixed to resin by resin resin to maintain the explosion-proof characteristics of the CRT. ), And a rectangular metal frame rail (3) fixed to the rear of the panel by a fritted glass, and fixed in a state in which tension is applied to the rail and in the form of a pore shape or a circular shape so as to serve as color screening of the electron beam. A shadow mask 4 through which the beam passage hole 4a is drilled innumerably, a funnel 5 bonded to the inner surface of the panel 1 by a glass and having a neck portion 5a integrally formed at the rear thereof, It consists of an electron gun 6 enclosed in the neck portion 5a to emit electron beams of three colors R, G, and B, and a deflection yoke 7 provided to surround the outer circumferential surface of the neck portion to deflect the electron beam.

The planar CRT configured as described above is applied to the cathode (not shown) of the electron gun 6 so that when the electron beam is generated, the R, G, and B electron beams are accelerated while passing through the accelerating electrode and the focusing electrode of the electron gun. After concentration, each R, G applied to the inner surface of the panel 1 through the beam passage hole 4a of the shadow mask 4 while being deflected in the horizontal or vertical direction by the magnetic field of the deflection yoke 7, Since it hits the B phosphor 1a accurately and emits the phosphor 1a, an image is reproduced.

Meanwhile, conventionally, the rail 3 is used as a means for fixing the shadow mask 4 at an appropriate interval with the panel 1, and the rail is manufactured in a fragmented form at first, and a square frame is formed by welding. Integrate with

As shown in FIG. 2, the rail 3 has a groove 3a formed at the side fixed to the inner surface of the panel 1 so as to fill the glass glass 8, and the shadow mask at the opposite side thereof. The flat surface 3b is formed in surface contact with 4).

The process for fixing the shadow mask 4 to the inside of the panel 1 using the rail 3 configured as described above will be described as follows.

First, the rail pieces of the square frame form are completed by combining the pieces of the rail by welding in one step.

In step 2, the glass 3 in the molten state is filled with the groove 3a formed on the panel 1 side of the rail 3, and the groove 3a of the rail 3 is directed toward the inner surface of the panel 1. Fusion

In this state, when the fusion portion is cooled, the panel 1 and the rail 3 can be firmly fixed by the solidification force of the glass glass 8.

In three steps, the flat surface 3b of the rail 3 is evenly ground in order to maintain a constant distance between the inner surface of the panel 1 and the shadow mask 4 opposite thereto.

In step 4, R, G, and B phosphors are applied to the inner surface of the panel 1 to which the rails 3 are coupled.

In the state where the shadow mask 4 is tensioned in step 5, the edge thereof is brought into close contact with the flat surface 3b of the rail 3, and the contact portion is fixed by welding.

As described above, in order to fix the shadow mask 4 to the panel 1, a medium called a rail 3 is essentially used, so that the number of components of the CRT increases, and the shadow mask 4 is used as a panel (1). ), It has to go through several steps in order to fix it, which has been a factor in reducing productivity.

In addition, since the shadow mask 4 is welded to the flat surface 3b of the rail 3 in a tensioned state, it is necessary to secure an area that can withstand the tensile force of the shadow mask.

As a result, the width of the rail 3 was inevitably increased, and the overall size of the panel 1 was also increased in proportion to this.

Then, as the glass glass 8 filled in the groove 3a of the rail 3 flows into and out of the panel 1 during the fusion process with the panel 1, the glass glass 8 is formed by the panel ( Since it occupies an unnecessary part of 1), it acted as another factor which the panel 1 becomes large.

The present invention has been made to solve the conventional problems as described above, the object is to simplify the process for fixing the shadow mask to the panel.

A first aspect of the present invention provides a flat panel, a shadow mask in which a plurality of beam passing holes are formed to serve as color screening, and a funnel incorporating an electron gun;

The stepped portion having an appropriate height is formed along the edge of the inner surface of the panel, and the stepped portion provides a flat CRT characterized in that the funnel and the shadow mask is fixed.

According to a second aspect of the present invention, there is provided a flat panel, a shadow mask in which a plurality of beam passing holes are formed to serve as color screening, and a funnel in which an electron gun is embedded;

A square frame skirt having the appropriate thickness is fixed to the inner surface of the panel,

The skirt surface is provided with a flat CRT, characterized in that the funnel and the shadow mask is fixed to each other.

1 is a longitudinal sectional view showing an example of a general flat CRT

Figure 2 is a cross-sectional view of the main portion of a conventional flat CRT tube showing a state in which the rail and the panel are joined.

3 is a cross-sectional view of the main part of the present invention the planar CRT showing a state in which a step is formed on the inner surface of the panel and a shadow mask is bonded to the step.

Figure 4a is to make the shadow mask to be fixed to the step by the fixing member of the present invention, in particular the main cross-sectional view showing a first embodiment of the fixing member

4B is a sectional view showing the principal parts of a second embodiment of a fixing member;

4C is a sectional view showing the principal parts of a third embodiment of a fixing member;

Fig. 5A is a sectional view showing the principal parts of a first embodiment of a fixing member for fixing a damping wire;

Fig. 5B is a view of Fig. 5A viewed in the A direction;

Fig. 5C is a sectional view showing the principal parts of a second embodiment of a fixing member for fixing a damping wire;

FIG. 5D is a view of FIG. 5C seen in direction B;

6 is a cross-sectional view of the main part of a flat CRT tube showing a state in which a skirt instead of a rail role is manufactured and attached to an inner surface of a panel

Explanation of symbols for main parts of the drawings

1 panel 1b step

1c: step surface 1d: step surface

1e: Skirt 4: Shadow Mask

4a: beam passing hole 5: funnel

6: electron gun 10, 10a, 10b, 10d, 10g: fixed plate

10c: extension piece 10e, 10h, 10i: protruding jaw

10f: depression 11: damping wire

12: welding piece

Figure 3 is a cross-sectional view of the main portion of the flat CRT tube of the present invention showing a state in which a step is formed on the inner surface of the panel and the shadow mask is bonded to the step, and FIG. 4 is a cross-sectional view of the main part showing a second embodiment of the fixing member, and FIG. 4C is a sectional view of the main part showing a third embodiment of the fixing member. FIG. 5A is a cross-sectional view showing main parts of a first embodiment of a fixing member for fixing the damping wire, FIG. 5B is a view of FIG. 5A seen in the A direction, and FIG. 5C is a second view of the fixing member for fixing the damping wire. 5D is a view of FIG. 5C in the B direction, and FIG. 6 is a flat CRT tube showing a state in which a skirt instead of the rail role is manufactured and attached to the inner surface of the panel. More specifically for the flat cathode-ray tube of the present invention with a cross-section recess, with reference to these attached drawings as follows.

The present invention integrally forms the stepped portion 1b corresponding to the height of the existing rail 3 along the edge of the inner surface of the panel 1 to which the phosphor 1a is applied, and has a funnel (b) on the stepped portion 1b. 5) and the shadow mask 4 are respectively bonded.

In particular, the open end of the funnel 5 is joined by fritted glass near the edge of the stepped portion 1b, and the shadow mask 4 is joined to an end side near the center of the stepped portion of the stepped surface 1c. It was.

At this time, since the stepped portion 1b is a glass material integrally formed in the panel 1, when joining the shadow mask 4, which is a metal material, may have difficulty in the joining operation due to the heterogeneity of the material.

Therefore, a separate fixing member made of the same metal material is attached to the stepped surface, and the shadow mask 4 is welded on the fixing member to maintain a more stable bonding force, and the fixing member has various forms as described below. Can be applied as

First, Figure 4a is a first embodiment of the fixing member (hereinafter referred to as "fixing plate"), the shape of the fixing plate 10 of the metal material in the form of a flat plate on the contact portion with the shadow mask (4) of the step (1b) It joins and it is the structure which bonded the shadow mask 4 on this fixed plate.

Since the fixing plate 10 and the shadow mask 4 are made of a metal material, the fixing plate 10 and the shadow mask 4 are bonded by general welding, and the fixing plate 10 and the stepped portion 1b may be bonded by fritted glass or electrostatic bonding.

On the other hand, since the shadow mask 4 is bonded to the fixed plate in a tensioned state, the fixed plate must secure a sufficient contact area with the stepped surface to withstand this tensile force, but the fixed plate 10a of FIG.

That is, the fixing plate 10a has a cross-sectional shape in a '-shape' shape, and the stepped portion is formed by successively joining the inner surface of the fixing plate 10a to the step surface 1c and the step surface 1d adjacent to the phosphor 1a. It is a form which extended the joining area of the fixed plate 10a with respect to (1b), and improved the joining force.

The a-shaped fixing plate 10a has a larger bonding area with the stepped portion 1b than the plate-shaped fixing plate 10, so that a more stable fixing force can be obtained.

Meanwhile, FIG. 4C is a modified form of FIG. 4B, in which a vibration damping function is added.

That is, the extension piece 10c is formed in the corner portion of the A-shaped fixing plate 10b in a direction parallel to the shadow mask 4, so that the extension piece 10c when the shadow mask 4 is vibrated by the collision with the electron beam. The vibration of the shadow mask is exhausted by the contact with.

At this time, the extension piece 10c is formed toward the inner surface of the panel 1 toward the opposite end from the end connected to the fixing plate 10b, so as to maintain a predetermined distance from the shadow mask 4. When the shadow mask 4 does not vibrate, the shadow mask and the extension piece 10c are spaced apart, and when the shadow mask 4 vibrates, the vibration of the shadow mask 4 is exhausted while contacting the extension piece 10c. It will play a role.

If the extension piece 10c is straight and the extension piece and the shadow mask 4 are always in contact with each other, the extension piece 10c may vibrate together due to the vibration force of the shadow mask 4. The vibration effect of the can not be obtained.

On the contrary, since the contact portion with the extension piece 10c of the shadow mask 4 may be damaged by repeated contact force with the extension piece 10c when the shadow mask 4 vibrates, the extension piece 10c and the extension piece 10c may be damaged. It is desirable to avoid constant contact of the shadow mask 4.

Meanwhile, FIGS. 5A to 5D illustrate a structure of a fixing plate for laying a damping wire. First, the stepped portion 1b of the fixing plate 10d as in the embodiment of FIGS. 5A and 5B. The surface to be joined is formed flat, and the opposite side forms a stepped surface, and the edge of the shadow mask 4 is joined to the protruding jaw 10e of the stepped surface in a tensioned state, and the recessed portion 10f of the stepped surface is joined. ) Is bonded to both ends of the damping wire 11 to cross the outer surface of the shadow mask (4).

5C and 5D show another embodiment for bonding the damping wire to the fixing plate, one side of the fixing plate 10g is formed flat, and the shadow mask 4 and the damping wire 11 are opposite to the other side. Are formed to form a U-shaped cross section in which the protruding jaws 10h and 10i are formed so as to be joined to each other, and the flat surface of the fixing plate 10g is joined to the inner edge side of the stepped surface 1c of the stepped section 1b. The inner projection jaw (10h) is bonded to the shadow mask (4), the outer projection jaw (10i) is bonded to the damping wire (11) to cross the outer surface of the shadow mask (4).

At this time, the damping wire 11 is commonly bonded in the short side direction of the shadow mask 4 in the two embodiments, and must be bonded to pass between the beam through holes (4a) formed in the shadow mask.

The flat CRT according to the present invention configured as described above forms a stepped portion 1b corresponding to the existing rail height h along the edge of the inner surface of the panel 1, and the funnel 5 and the shadow are formed on the stepped surface 1c. The mask 4 is bonded.

At this time, the shadow mask 4 is bonded to the inner edge side of the stepped surface 1c in the tensioned state, and the open end of the funnel 5 is bonded to the outer edge side of the stepped surface 1c by fritted glass.

When the shadow mask 4 is directly bonded to the stepped surface 1c as described above, since the materials of the stepped portion 1b and the shadow mask 4 are different from each other, the joining operation may be difficult. Since there is a possibility of problems in terms of strength, it is preferable to join using various types of metal fixing plates as shown in Figures 4a to 4c to prevent this in advance.

First, in the case of the flat fixing plate 10, the fixing plate 10 is bonded to the inner edge portion of the stepped surface 1c as shown in FIG. 4A, and the shadow mask 4 is tensioned on the fixing plate 10 to its edge. The parts are joined by welding.

Since the fixing plate 10 is small in size but bonded to the stepped surface 1c by surface contact, the fixing plate 10 may be more efficient in terms of bonding strength and size than conventional rails.

However, since the plate-shaped fixing plate 10 is bonded only to the stepped surface, the bonding force may be weakened by the tensile force of the shadow mask 4. Thus, in order to prevent this in advance, a form in which the bonding area is expanded as shown in FIG. 4B is applied. can do.

The fixing plate 10a of FIG. 4B has a L-shape in cross-section, and the fixing plate 10a is attached to the stepped surface 1c and the inner stepped surface 1d by joining its inner surface to the inner edge of the stepped portion 1b. Since the state is subsequently joined, the bonding area is expanded compared to the flat plate 10, it is possible to obtain a more strengthened bonding force.

In addition, the fixing plate 10b shown in FIG. 4C forms an extension piece 10c parallel to the shadow mask 4 at the corners of the L-shaped fixing plate 10a, and is joined to the extension piece and the fixing plate 10a. The shadow mask 4 is in the form of adding a role of exhausting the vibration while contacting when the shadow mask 4 is vibrated due to the collision with the electron beam.

At this time, when the shadow mask 4 is not vibrated by forming the inner surface of the panel 1 toward the opposite end from the fixed end of the extension piece 10c, the shadow mask and the extension piece 10c are mutually different. When the shadow mask is spaced apart and the shadow mask is in contact with the extension piece 10c, the vibration is attenuated.

On the other hand, Figure 5a to 5d is a structure that can additionally bond the damping wire to the fixed plate for vibration damping of the shadow mask.

5A and 5B have a cross-sectional shape of the fixed plate 10d in a b-shape, the surface bonded to the stepped portion 1b of the fixed plate is formed flat, and the opposite side forms a stepped surface. The edge of the shadow mask 4 is bonded to the protruding jaw 10e in the tensioned state, and the damping wire 11 is bonded to the depression 10f of the stepped surface so as to cross the outside of the shadow mask 4. Form.

5C and 5D show a flat surface joined to the stepped surface 1c of the fixing plate 10g, and a pair of protruding jaws to connect the shadow mask 4 and the damping wire 11 to the opposite surface thereof. (10h) (10i) is formed, so that the shadow mask 4 is bonded to the inner projection jaw (10h) in a tensioned state, and the outer projection jaw (10i) to cross the outer surface of the shadow mask (4) The damping wire 11 is bonded together.

5A and 5C may be referred to as a form in which vibration damping capability of the shadow mask 4 is further enhanced by adding a damping wire 11.

In addition, in each of the two embodiments for installing the damping wire 11, each beam passing hole of the shadow mask 4 when the damping wire 11 crosses the outer surface of the shadow mask 4. (4a) should be passed between the beam passing holes so as to prevent the electron beam from being disturbed by the damping wire 11 when passing through the beam passing holes 4a.

At this time, the damping wire 11 is allowed to cross in the short side direction of the shadow mask 4 with a clearance between the beam through hole (4a) so that the damping wire 11 can pass through the beam through hole (4a) Possible problems should be prevented beforehand.

In addition, since the thickness of the damping wire is relatively thin when the damping wire 11 is joined to the fixing plates 10d and 10g, it may be difficult to weld, so that the contact surface with the fixing plate 12 is padded with the welding pieces 12. It is desirable to make the welding easier by widening the.

On the other hand, the distance from the shadow mask 4 to the inner surface of the panel 1, the three-color electron beam of R, G, B is applied to the inner surface of the panel 1 through the beam through hole (4a) of the shadow mask (4) It is an important factor for accurately irradiating each phosphor 1a that is present.

If the gap is narrower than the target distance from the shadow mask 4 to the inner surface of the panel 1, the electron beams overlap. If the gap is wider than the target distance, the R, G, and B electron beams are precisely R, G, B. There is a problem that the phosphor 1a cannot be irradiated and, for example, the R electron beam is irradiated to the G phosphor.

Therefore, the distance between the shadow mask 4 and the panel 1 should be managed accurately, for this purpose (the pitch of the beam passing holes formed in the shadow mask) × (the distance between the electron gun and the inner surface of the panel) / (the first of the electron beams). The interval is determined by the value calculated by the firing interval).

At this time, the distance from the inner surface of the panel 1 to the step surface 1c (thickness of the step) is preferably within the range of 70 to 100% of the distance from the inner surface of the panel 1 to the shadow mask 4. It is a set value in consideration of the thickness of each fixing plate.

That is, the distance from the inner surface of the panel 1 to the stepped surface 1c is inevitably smaller than the distance from the inner surface of the panel 1 to the shadow mask 4, for the reason that the shadow mask 4 is formed from the inner surface of the panel 1. This is because the thickness of the fixing plate is added to the distance to).

Meanwhile, in the above description, the stepped portion 1b is integrally formed on the inner surface of the panel 1. However, as shown in FIG. 6, the skirt 1e having a rectangular frame shape is separately manufactured and bonded to the inner surface of the panel 1. May be applied.

Such a skirt (1e) has the same function as the stepped portion (1b), only the method of making and attaching independently is different.

At the time of fusion of the skirt 1e and the panel 1, the glass 1 is joined by the glass glass 8 because the same glass material is used.

As described above, the present invention has a structure in which a step that replaces the role of the existing rail is integrally formed or separately formed and joined to the inner surface of the panel, thereby simplifying the number of components and removing the shadow mask to the panel. Since the process for joining can be simplified, it contributes to productivity improvement.

Claims (14)

A flat panel, a shadow mask having a plurality of beam passing holes formed therein to serve as color screening, and a funnel having an electron gun embedded therein; And a stepped portion having an appropriate height along an edge of the inner surface of the panel, and fixing the funnel and a shadow mask to the stepped portion, respectively. The method of claim 1, In order to fix the shadow mask to the stepped portion, And a fixing plate attached to the stepped portion, and a shadow mask is fixed on the attached fixing plate by welding. The method of claim 2, A flat CRT tube, wherein the fixing plate is made of metal. The method according to claim 2 or 3, The flat plate is formed in a flat plate, characterized in that attached to only the inner surface of the stepped flat CRT. The method according to claim 2 or 3, A flat CRT tube, characterized in that the cross section of the fixing plate has a shape of “a”, so that the fixing piece is continuously attached to the inner surface and the step surface of the step. The method of claim 5, An extension piece is formed in a direction parallel to the shadow mask in the corner portion of the fixing plate, so that the shadow mask is buffered by contact with the extension piece when the shadow mask vibrates. The method of claim 6, The extension piece is formed toward the inner surface of the panel toward the end thereof, so that when the shadow mask does not vibrate, the extension piece is not in contact with the extension piece, and when the shadow mask vibrates, the vibration of the shadow mask is attenuated. Flat CRT. The method of claim 2, A flat CRT tube, characterized in that the stepped portion and the fixed plate are joined by fritted glass. The method of claim 2, A flat CRT tube, characterized in that the stepped portion and the fixed plate are joined by electrostatic bonding. The method of claim 1, A flat CRT tube, characterized in that the distance from the inside of the panel to the fixing plate is the same as the distance from the inside of the panel to the shadow mask. The method of claim 1, The distance from the shadow mask to the inside of the panel is A flat CRT tube, which is calculated by (the distance between the beam passing hole pitch of the shadow mask x the electron gun and the inner surface of the panel) / (gap of the electron beam). A flat panel, a shadow mask having a plurality of beam passing holes formed therein to serve as color screening, and a funnel having an electron gun embedded therein; A square frame skirt having an appropriate thickness is attached to the inner surface of the panel, And a funnel and a shadow mask respectively fixed to the skirt. The method of claim 2 or 3, The surface bonded to the stepped portion of the fixing plate is formed flat, the opposite side forms a step surface, the shadow mask is bonded to the protruding portion of the step surface, the outer surface of the shadow mask to the recessed portion of the step surface A flat CRT tube, characterized in that the damping wire is joined to cross. The method of claim 13, A flat CRT tube characterized in that the welding is made easier by attaching a welding piece having an appropriate width when joining the damping wire to the fixing piece.